CN104952323A - Self-circulation Bernoulli experimental device with teaching effect flow digital display function - Google Patents
Self-circulation Bernoulli experimental device with teaching effect flow digital display function Download PDFInfo
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Abstract
The invention discloses a self-circulation Bernoulli experimental device with a teaching effect flow digital display function. The self-circulation Bernoulli experimental device comprises a self-circulation Bernoulli experimental instrument, wherein the self-circulation Bernoulli experimental instrument comprises a Bernoulli experimental pipeline, a pressure difference high-end liquid gas converting tube, a pressure difference low-end liquid gas converting tube, a pressure difference sensor and a microcomputer digital display meter; one section in the Bernoulli experimental pipeline is a pressure difference type flow signal generator used for generating pressure difference signals; the pressure difference high-end liquid gas converting tube and the pressure difference low-end liquid gas converting tube are connected with the pressure difference type flow signal generator; the pressure difference sensor is connected with the pressure difference high-end liquid gas converting tube and the pressure difference low-end liquid gas converting tube in a sealed way and is used for detecting the pressure difference; the microcomputer digital display meter is connected with the pressure difference sensor and is used for converting pressure difference signals detected by the pressure difference sensor into flow. The self-circulation Bernoulli experimental device has the advantages that the teaching effect flow digital display function is achieved; in the optimal technical scheme, the self-circulation Bernoulli experimental device with the teaching effect flow digital display function can also realize the real-time zero setting function in the normal flow measurement experiment process and is a low-pressure-difference high-precision flow instrument.
Description
Technical field
The present invention relates to experimental measurement field, be specifically related to a kind of self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display.
Background technology
Bernoulli equation is the energy equation of incompressible liquid steady flow, it is one of large important equation of hydraulics and fluid mechanics three, its physical significance is: current flow to another section process from a section, the potential energy of unit weight liquid, pressure energy, kinetic energy can be changed mutually, but the unit total mechanical energy of previous section should equal the energy loss sum of fluid between the unit total mechanical energy of a rear section and two sections, energy loss has dissipated with the form of heat energy, therefore, the conversion and between other three energy is irreversible.Bernoulli equation education experiment is one of important content of courses of hydraulics and fluid mechanics.
Wherein, the patent No. is self circulating bernoulli equation experiment instrument that the Chinese utility model patent of ZL 200420091079.5 discloses a kind of desktop miniaturization, that possess independent self-loopa constant pressure water supply system, adopted by universities and colleges of domestic hundreds of institute since invention in 2005, facilitate and carry out modern experiment teaching.As the experiment of student's theoretical validation, this wherein very important experimental physics amount measurement parameter is the flow of experimental channel.During tradition determination experiment pipeline flow, need when stability of flow, (namely manual time-keeping is passed through by gravimetric method, go out head piece water drum at the downstream tank of ozzle jet and access a water, and obtain water volume with electronic scale weighing conversion, stream flow can be obtained out divided by timing time again) or volumetric method (directly access out flowing water with large graduated cylinder, and with manual time-keeping) remove experiments of measuring pipeline go out flow, waste time and energy, experimental situation also easily do wet do dirty, the flow-measuring method study of student to this quasi-tradition can reach experimental teaching object 1 ~ 2 time later, do not need to repeat the traditional measuring method of this kind of craft to each hydrodynamic calculations, can by save the valuable experimental implementation time better be used for experimental principle probe into in study.Meanwhile, conventional flow measuring method also cannot in real time experiments of measuring pipeline go out flow.
Along with the development of modern measurement technology, the experimental apparatus in other every profession and trade fields on the Innovation and application of modern measurement technology far ahead of fluid mechanics class experiment teaching instrument.And this kind of important basic experimental apparatus of self circulating bernoulli equation experiment instrument is wanted to realize digitizing measurement, want the network remote realizing comprehensive observing and controlling, realize future to test, realize classroom tele-experimentation measuring and demonstrating, what the first step will solve is exactly that the digitizing how realizing above-mentioned flow measures problem.Simultaneously, original experimental channel should be retained as experiment teaching instrument, can not destroy the pressure tap in Bernoulli Jacob's experimental channel, and applied fluid mechanics ultimate principle solves the high-acruracy survey problem of small-bore experiment tube low discharge in Bernoulli Jacob's experiment instrument, can have more teaching efficiency.
On actual market, can be applicable to Bernoulli Jacob's experimental apparatus experimental channel even section experiment caliber 14 millimeter, the high-precision flow of digit display measurement mechanism of low discharge of water flow scope 10-300ml/s, is in space state at present.Education experiment is used usually if traditional weight chronometry or volume chronometry hand dipping are main.If when being equipped with modern measuring instrument, for typical differential flow instrument, in experimental teaching application, but there is a lot of problem.Differential signal generator (the routine venturi of differential flow instrument, orifice plate etc.) the flow signal pressure reduction great majority that produce are only 0.1-50 centimeter water column, and existing flow instrument is directly connected with the pressure tap of pressure difference signal generator by sensor by cross current pipe, the pressure of sensor is transmitted by water body, sensor side is sealing, inside there is air barrier, pressure water post in communicating pipe can not act directly on the pressure chip of sensor, again because the pressure communication channel in sensor is very tiny, thus on liquid gas interface, very large surface tension is produced, its value can reach 1-5 centimeter water column, even larger, the pressure error of flow signal is made to reach more than 10%, low and middle-end flow error can be caused to reach 10%-30%, thus this type of flow instrument cannot for there being the experiment device for teaching of high-precision requirement, now commercially also there are the non-differential flow instruments such as the turbo flow meter of supply pipe with small pipe diameter, but the flow measurement range of the above precision of this type flowmeter 1%-2% at present, the 70%-100% of its full scale, all inapplicable below 30%, and self-loopa Bernoulli Jacob experiment instrument empirical flow scope is just in time in less than 30%, so be also to select.
By upper, carry out innovation to Bernoulli Jacob's experimental apparatus, the modern digital display flow instrument possessing teaching efficiency developed for Bernoulli Jacob's experimental apparatus is demand day by day urgent at present.
Summary of the invention
The object of this invention is to provide a kind of self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display, in optimal technical scheme, the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display can also return to zero in real time in normal flow measurement experimentation, is low voltage difference high-precision flow instrument.
Possess a self-loopa Bernoulli Jacob experimental provision for teaching efficiency flow digital display, it is characterized in that, comprising:
Self-loopa Bernoulli Jacob experiment instrument, includes: Bernoulli Jacob's experimental channel, and one section in described Bernoulli Jacob's experimental channel is the differential flow signal generator for generation of pressure difference signal;
The pressure reduction high-end liquid cyclostrophic creeling be connected with described differential flow signal generator and the creeling of pressure reduction low side liquid cyclostrophic, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a deflating valve, and these two deflating valves are externally connected with movable sealing plug;
Be tightly connected with the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic, for detecting the differential pressure pickup of the pressure reduction of described pressure reduction high-end liquid cyclostrophic creeling compressed air and pressure reduction low side liquid cyclostrophic creeling compressed air;
Be connected with described differential pressure pickup, the pressure difference signal for being detected by described differential pressure pickup converts the micro computer digital display meter of flow to.
In the present invention, self-loopa Bernoulli Jacob experiment instrument can adopt the patent No. to be the basic structure of ZL200420091079.5: it has self-loopa supply tank, electric control pump is provided with in self-loopa supply tank, constant pressure water tank is placed on experiment table, constant pressure water tank connects with experimental channel (i.e. Bernoulli Jacob's experimental channel), experimental channel afterbody arranges flow control valve, self-loopa water recovery apparatus is divided in experimental channel outlet, constant pressure water tank is connected by upper hose and downcomer with self-loopa supply tank, overflow plate is provided with in constant pressure water tank, water-stabilizing board, water-stabilizing board's side direction has steady water hole, overflow plate and water-stabilizing board are divided into overflow area by constant pressure water tank, steady pool and areas of permanent pressure.Experimental channel is furnished with successively multiple hydrostatic measuring point, multiple Pitot tube stagnation pressure measuring point, each hydrostatic measuring point, Pitot tube stagnation pressure measuring point were connected with corresponding piezometric tube each in rack of measuring pressure respectively by communicating pipe, and rack of measuring pressure is provided with slide rule.
As preferably, described self-loopa Bernoulli Jacob experiment instrument also includes:
Self-loopa supply tank;
Constant pressure water tank, the side of described constant pressure water tank is connected with described self-loopa supply tank, and opposite side is connected with described Bernoulli Jacob's experimental channel;
To be arranged in described self-loopa supply tank and electric control pump for supplying water to described constant pressure water tank;
Be arranged on the flow control valve of the afterbody of described Bernoulli Jacob's experimental channel;
To be connected with described self-loopa supply tank and for the self-loopa water recovery apparatus of the afterbody water outlet of accepting described Bernoulli Jacob's experimental channel;
The multiple straight pipe type piezometric tube that connect corresponding to the multiple pressure taps on described Bernoulli Jacob's experimental channel.
Described Bernoulli Jacob's experimental channel comprises the pipeline section of pipe diameter size change and the pipeline section of pipe height change of series connection.
The present invention has differential flow signal generator, connects the high-end independent double-cylinder type liquid cyclostrophic creeling with pressure reduction low side of pressure reduction, differential pressure pickup and micro computer digital display meter respectively.Micro computer digital display meter, can realize the method for the signal voltage of input by array matching, makes output become corresponding flow magnitude of physical quantity digital display and exports.Adopting the creeling of liquid cyclostrophic to improve measuring accuracy, is the high-accuracy flowrate measuring tool of a kind of low voltage difference.
Described differential flow signal generator is the flow measurement pipeline section that can produce pressure difference signal.Structure is measured in the substantially differential front end that differential flow signal generator can adopt venturi, ozzle, orifice-plate type etc. to write several fluid mechanics measuring flows of textbook over 100 years, self-loopa Bernoulli Jacob experiment instrument is because be designed with venturi experiment pipeline section in experimental channel own, therefore, preferably this venturi tests pipeline section as differential flow signal generator.
As preferably, described differential flow signal generator is provided with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe;
The creeling of described pressure reduction high-end liquid cyclostrophic is provided with the water inlet be communicated with described pressure reduction high side pressure conducting tube;
Described pressure reduction low side liquid cyclostrophic creeling is provided with the water inlet be communicated with described pressure reduction low side pressure transmission pipe.
Further preferably, the water inlet of described pressure reduction high-end liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction high-end liquid cyclostrophic creeling;
The water inlet of described pressure reduction low side liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction low side liquid cyclostrophic creeling.
Further preferably, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction high-end liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction high-end liquid cyclostrophic creeling;
The deflating valve of described pressure reduction low side liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction low side liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction low side liquid cyclostrophic creeling.
As preferably, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a valve, the valve of described pressure reduction high-end liquid cyclostrophic creeling is described pressure reduction high-end liquid cyclostrophic creeling and the connecting interface of differential pressure pickup, and the valve of described pressure reduction low side liquid cyclostrophic creeling is described pressure reduction low side liquid cyclostrophic creeling and the connecting interface of differential pressure pickup;
The valve of described pressure reduction high-end liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling;
The valve of described pressure reduction low side liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction low side liquid cyclostrophic creeling.
Further preferably, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling and the deflating valve of described pressure reduction low side liquid cyclostrophic creeling contour.
Further preferably, the described self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display also comprises: the high-end electric control valve of pressure reduction, pressure reduction low side electric control valve and control the control circuit of the high-end electric control valve of described pressure reduction and pressure reduction low side electric control valve;
The high-end electric control valve of described pressure reduction be connected on the creeling of described pressure reduction high-end liquid cyclostrophic be connected with differential pressure pickup between in gas circuit; Described pressure reduction low side electric control valve be connected on described pressure reduction low side liquid cyclostrophic creeling be connected with differential pressure pickup between in gas circuit;
The high-end electric control valve of described pressure reduction at least comprises three tunnels, one tunnel of the high-end electric control valve of described pressure reduction is communicated with the valve of described pressure reduction high-end liquid cyclostrophic creeling, another road of the high-end electric control valve of described pressure reduction is measured mouth with described differential pressure pickup first and is connected, and also has a road and air conducting;
Described pressure reduction low side electric control valve at least comprises three tunnels, one tunnel of described pressure reduction low side electric control valve is communicated with the valve of described pressure reduction low side liquid cyclostrophic creeling, another road of described pressure reduction low side electric control valve is measured mouth with described differential pressure pickup second and is connected, and also has a road and air conducting.
When the high-end electric control valve of pressure reduction and the energising of pressure reduction low side electric control valve, the pressure measurement end making differential pressure pickup all with air conducting, can return to zero in real time.
Compared with prior art, tool of the present invention has the following advantages:
1, the self-loopa Bernoulli Jacob experimental provision ingenious applied fluid mechanics principle possessing teaching efficiency flow digital display solves the high-acruracy survey problem of the small-bore experiment tube low discharge of Bernoulli Jacob's experiment instrument: devise double-cylinder type liquid-gas transfer device, by between flow signal generator and sensor by the mode of the direct transmission of pressure of the liquid in communicating pipe, by the bitubular of liquid gas shift, change the medium of gas into, send pressure to sensor, completely eliminate the surface tension effects on sensor connecting path, make the precision of low discharge can bring up to 1% by 10%, and the high-precision digital-display flow instrument having filled up this type of desktop type miniature fluid Experiments of Machanics instrument of picture Bernoulli Jacob experiment instrument is blank,
2, this experimental provision is air because of the pressure transmission medium of high precision sensor, thus makes cell pressure chip away from water or corrosivity hydraulic fluid, sensor is improved serviceable life greatly;
3, the differential flow signal generator of venturi that configures of this experimental provision is that long-term write is in the last hundred years taught the flowmeter of conventional fluid mechanics principle application of book.Introduce experimental teaching, student is had to the results of learning of good theoretical connected applications;
4, this experimental provision is after use liquid gas shift pressure measurement cylinder, apply automatically controlled miniature Standard Valve Design gas path on-off switched system cleverly, 2 of differential pressure pickup pressure measurement interfaces can be made at any time all to lead to air, Bernoulli Jacob's experiment instrument real-time, tunable zero in experimentation can be made, avoid in measurement process traditional instrument when needing to detect zero point and just must can carry out the trouble that verifies by complete shut-down flow valve, this real-time detection function is especially necessary in education experiment.
5, be configured with micro computer digital display meter, flow simulation voltage can be become real-time flow data by chip modulus non-linear conversion, digital display shows, intuitive and convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention possesses the self-loopa Bernoulli Jacob experimental provision of teaching efficiency flow digital display;
Fig. 2 is the structural representation of double-cylinder type high-precision flow digital display instrument in the present invention;
Fig. 3 is the circuit diagram of the high-end electric control valve of pressure reduction of the present invention, pressure reduction low side electric control valve and control circuit.
Embodiment
As shown in Figure 1, a kind of self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display, comprising: self-loopa Bernoulli Jacob experiment instrument and double-cylinder type high-precision flow digital display instrument 38.
Self-loopa Bernoulli Jacob experiment instrument is the structural design of ZL 2,004 2 0091079.5 with reference to the employing patent No., as shown in Figure 1, described self-loopa Bernoulli Jacob experiment instrument includes: Bernoulli Jacob's experimental channel 33 (i.e. experimental channel 33), and one section in Bernoulli Jacob's experimental channel 33 is the differential flow signal generator 41 for generation of pressure difference signal; Self-loopa supply tank 21; Constant pressure water tank 25, the side of constant pressure water tank 25 is connected with self-loopa supply tank 21, and opposite side is connected with Bernoulli Jacob's experimental channel 33; To be arranged in self-loopa supply tank 21 and electric control pump (not shown) for supplying water to constant pressure water tank 25; Be arranged on the flow control valve 37 of the afterbody of Bernoulli Jacob's experimental channel 33; To be connected with self-loopa supply tank 21 and for the self-loopa water recovery apparatus 24 of the afterbody water outlet of accepting Bernoulli Jacob's experimental channel 33; The multiple straight pipe type piezometric tube 36 that connect corresponding to the multiple pressure taps on Bernoulli Jacob's experimental channel 33.Bernoulli Jacob's experimental channel 33 comprises the pipeline section of pipe diameter size change and the pipeline section of pipe height change of series connection.Self circulating bernoulli equation experiment instrument, it has self-loopa supply tank 21, electric control pump is provided with in self-loopa supply tank 21, constant pressure water tank 25 is placed on experiment table 22, connect with experimental channel 33 successively, experimental channel 33 afterbody arranges flow control valve 37, self-loopa water recovery apparatus 24 is divided in experimental channel 33 outlet, constant pressure water tank 25 is connected by upper hose and downcomer with self-loopa supply tank 21, overflow plate 27 is provided with in constant pressure water tank 25, water-stabilizing board 26, water-stabilizing board 26 side direction has steady water hole, overflow plate 27 and water-stabilizing board 26 will be divided into overflow area 28 in constant pressure water tank, steady pool 29 and areas of permanent pressure 30.Experimental channel 33 is furnished with successively multiple hydrostatic measuring point 31, multiple Pitot tube stagnation pressure measuring point 32, multiple hydrostatic measuring point 31 and multiple Pitot tube stagnation pressure measuring point 32 are pressure tap
each hydrostatic measuring point 31, Pitot tube stagnation pressure measuring point 32 were connected with corresponding straight pipe type piezometric tube 36 each in rack of measuring pressure 34 respectively by communicating pipe, and rack of measuring pressure 34 is provided with slide rule 35.
The course of work of this self circulating bernoulli equation experiment instrument is: open electric control pump and supply water to constant pressure water tank 25, and keep overflow, under water supply constant voltage head, water body flows through experimental channel 33, flow control valve 37 regulates flow in experimental channel 33, experimental channel is recorded along journey cross sections piezometric head and gross head, checking Bernoulli equation by pressure measuring system.
As shown in Figure 2, double-cylinder type high-precision flow digital display instrument 38 includes: for generation of the differential flow signal generator 41 of pressure difference signal; The pressure reduction high-end liquid cyclostrophic creeling 44 be connected with differential flow signal generator 41 and pressure reduction low side liquid cyclostrophic creeling 48, pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48 are respectively provided with a deflating valve 43; Be connected with pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48, for detecting the differential pressure pickup 46 of the pressure reduction of pressure reduction high-end liquid cyclostrophic creeling 44 compressed air and pressure reduction low side liquid cyclostrophic creeling 48 compressed air; Be connected with differential pressure pickup 46, the pressure difference signal for being detected by differential pressure pickup 46 converts the micro computer digital display meter 50 of flow to.
Double-cylinder type high-precision flow digital display instrument 38, also comprises: the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52 and control the control circuit of the high-end electric control valve 51 of pressure reduction and pressure reduction low side electric control valve 52.The high-end electric control valve 51 of pressure reduction at least comprises three tunnels, and a road of the high-end electric control valve of pressure reduction 51 is communicated with pressure reduction high-end liquid cyclostrophic creeling 44 compressed air, and another road of the high-end electric control valve 51 of pressure reduction is connected with differential pressure pickup 46, also has a road and air conducting.Pressure reduction low side electric control valve 52 at least comprises three tunnels, and a road of pressure reduction low side electric control valve 52 is communicated with pressure reduction low side liquid cyclostrophic creeling 48 compressed air, and another road of pressure reduction low side electric control valve 48 is connected with differential pressure pickup 46, also has a road and air conducting.
As shown in Figure 3, control circuit comprises power supply and by opening up pass 53, be connected with the positive pole of power supply by opening up one end, pass 53, the other end is connected with the positive pole of the high-end electric control valve 51 of pressure reduction and the positive pole of pressure reduction low side electric control valve 52, and the negative pole of the high-end electric control valve 51 of pressure reduction is connected with the negative pole of power supply with the negative pole of pressure reduction low side electric control valve 52.
Differential flow signal generator 41 is the flow measurement pipeline section that can produce pressure difference signal.In concrete this self-loopa of employing Bernoulli Jacob experiment instrument experimental channel 33 pressure tap 5. ~ 8. between one section of venturi experiment pipeline section.
The maximum inner diameter tube wall of the venturi experiment pipeline section on differential flow signal generator 41 is provided with pressure reduction high side pressure conducting tube and contraction section minimum diameter place is provided with pressure reduction low side pressure transmission pipe.
Pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48 are respectively provided with a water inlet 45, and the water inlet in pressure reduction high-end liquid cyclostrophic creeling 44 is communicated with pressure reduction high side pressure conducting tube; Water inlet in pressure reduction low side liquid cyclostrophic creeling 48 is communicated with pressure reduction low side pressure transmission pipe.The water inlet of pressure reduction high-end liquid cyclostrophic creeling 44 is positioned at the sidewall bottom of pressure reduction high-end liquid cyclostrophic creeling 44; The water inlet of pressure reduction low side liquid cyclostrophic creeling 48 is positioned at the sidewall bottom of pressure reduction low side liquid cyclostrophic creeling 48.
The deflating valve of pressure reduction high-end liquid cyclostrophic creeling 44 be arranged on pressure reduction high-end liquid cyclostrophic creeling 44 sidewall and higher than the water inlet of pressure reduction high-end liquid cyclostrophic creeling 44; The deflating valve of pressure reduction low side liquid cyclostrophic creeling 48 be arranged on pressure reduction low side liquid cyclostrophic creeling 48 sidewall and higher than the water inlet of pressure reduction low side liquid cyclostrophic creeling 48.
Pressure reduction high-end liquid cyclostrophic creeling 44 and pressure reduction low side liquid cyclostrophic creeling 48 are respectively provided with a valve 42, the valve of pressure reduction high-end liquid cyclostrophic creeling 44 is connected with the high-end electric control valve 51 of pressure reduction, and the valve of pressure reduction low side liquid cyclostrophic creeling 48 is connected with pressure reduction low side electric control valve 52.
The valve of pressure reduction high-end liquid cyclostrophic creeling 44 is higher than the deflating valve of pressure reduction high-end liquid cyclostrophic creeling 44; The valve of pressure reduction low side liquid cyclostrophic creeling 48 is higher than the deflating valve of pressure reduction low side liquid cyclostrophic creeling 48; The deflating valve of pressure reduction high-end liquid cyclostrophic creeling 44 and the deflating valve of pressure reduction low side liquid cyclostrophic creeling 48 contour.
Double-cylinder type high-precision liquid flow instrument in the present invention, there is differential flow signal generator 41, in real time zeroing electric control valve unit and control circuit thereof (i.e. the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52 and control the control circuit of the high-end electric control valve 51 of pressure reduction and pressure reduction low side electric control valve 52), the micro computer digital display meter 50 of the high-end independent double-cylinder type liquid cyclostrophic creeling 44 and 48 with pressure reduction low side of connection pressure reduction respectively, differential pressure pickup 46 and intelligent (band microcomputer chip).
Embodiment further illustrates as follows:
1, the bottom of the bitubular is respectively provided with water inlet 45, and be connected with the pressure tap (being respectively equipped with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe) of the height pressure side of differential flow instrument signal generator 41 respectively, top is respectively provided with valve 42, be connected with the pressure measurement mouth of differential pressure pickup 46 respectively, the elevation places such as middle part are provided with deflating valve 43 respectively, and deflating valve 43 can be exitted and be made the most promotion of liquid level in cylinder to deflating valve 43 position.When deflating valve 43 is closed, when cross current pipe 47 is full of continuous print bubble-free pressure water body, the press water of high low side pressure tap converts gaseous tension to by the bitubular, and act on the height pressure side of differential pressure pickup 46 respectively, make the pressure transmission medium in differential pressure pickup 46 and gas circuit connecting pipe 49 thereof be gas.Owing to existing without water body in differential pressure pickup 46 and gas circuit connecting pipe 49, thus also completely eliminate the surface tension effects on path that sensor classic method connects, make the precision of low discharge can bring up to 1% by 10%.When measuring beginning, deflating valve 43 (specifically can need be adopted bleed screw mouth, movable sealing plug is connected with in bleed screw mouth) open exhaust, until deflating valve 43 mouth mouth has water body to flow out, liquid level in cylinder is made no longer to increase, all this operation should be carried out respectively to the bitubular, because the deflating valve 43 of each is positioned on same elevation, therefore cylinder is interior after exhaust feed liquor, liquid level can keep same level (with on deflating valve 43 along same level face), now, if when in experimental channel 33, full-section pipe-flow flow is zero, air pressure in two pressure measurement cylinders is equal, adopt traditional sensor zeroing, compensating circuit initially returns to zero to differential pressure pickup.
2, in real time zeroing electric control valve unit and control circuit thereof (i.e. the control circuit of the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52 and the control high-end electric control valve 51 of pressure reduction and pressure reduction low side electric control valve 52) are on the pipeline of the gas circuit connecting pipe 49 of differential pressure pickup 46 pressure measurement mouth, be connected to one or more automatically controlled three-way air valve, an automatically controlled three-way air valve can adopt two automatically controlled two breather valves and threeway to combine replacement, and with control circuit, realize the electric control function of differential pressure pickup 46 zeroing in real time.Automatically controlled three-way air valve is all adopted, as shown in Figure 2 and Figure 3 for the high-end electric control valve of pressure reduction 51, pressure reduction low side electric control valve 52.The common port of the high-end electric control valve of pressure reduction 51 (automatically controlled three-way air valve) is connected with the high-pressure side of differential pressure pickup 46, Chang Kaiduan is connected with the valve of pressure reduction high-end liquid cyclostrophic creeling 44; In the pneumatic diagram of Fig. 1, the common port of pressure reduction low side electric control valve 52 (automatically controlled three-way air valve) is connected with the low pressure end of differential pressure pickup 46, Chang Kaiduan is connected with the valve of pressure reduction low side liquid cyclostrophic creeling 48; Fig. 3 is the electric control valve unit electrical control circuit schematic diagram that returns to zero in real time, when by open up pass 53 press time, the high-end electric control valve of pressure reduction 51 (automatically controlled three-way air valve) and pressure reduction low side electric control valve 52 (automatically controlled three-way air valve) are energized, the Chang Kaiduan be connected with the valve of pressure reduction low side liquid cyclostrophic creeling 48 with pressure reduction high-end liquid cyclostrophic creeling 44 is closed, logical atmosphere end is connected with common port, so all logical air in differential pressure pickup 46 two ends, now flow indication value should be zero, if not zero, be then adjustable as zero.This function provides the effect of an in real time zeroing for double-cylinder type high-precision liquid flow instrument 38, avoid in measurement process traditional instrument when needing to detect zero point and just must can carry out the trouble that verifies by complete shut-down flow valve, this real-time detection function is especially necessary in education experiment.
3, differential pressure pickup 46 is connected to traditional sensor zeroing compensating circuit, can adopt prior art, and realizing differential pressure pickup 46, to input pressure difference signal be zero, and when output voltage is non-vanishing, compensating approach is the function that no-voltage exports.Traditional sensor zeroing compensating circuit cardinal principle is the magnitude of voltage utilizing potentiometer change sensor to export to intelligent digital table, the signal negative terminal voltage that micro computer digital display meter 50 is received can regulate, thus make the displayed value of micro computer digital display meter 50, be adjustable as zero.
4, the digital display voltmeter (i.e. micro computer digital display meter 50) of intelligent (band microcomputer chip), its function had, the signal voltage of input by the method for array matching, makes output become corresponding flow magnitude of physical quantity by energy realization.This micro computer digital display meter 50 is conventional commercial instrument, easily purchases, and can adopt prior art.
Claims (9)
1. possess a self-loopa Bernoulli Jacob experimental provision for teaching efficiency flow digital display, it is characterized in that, comprising:
Self-loopa Bernoulli Jacob experiment instrument, includes: Bernoulli Jacob's experimental channel, and one section in described Bernoulli Jacob's experimental channel is the differential flow signal generator for generation of pressure difference signal;
The pressure reduction high-end liquid cyclostrophic creeling be connected with described differential flow signal generator and the creeling of pressure reduction low side liquid cyclostrophic, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a deflating valve, and these two deflating valves are externally connected with movable sealing plug;
Be tightly connected with the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic, for detecting the differential pressure pickup of the pressure reduction of described pressure reduction high-end liquid cyclostrophic creeling compressed air and pressure reduction low side liquid cyclostrophic creeling compressed air;
Be connected with described differential pressure pickup, the pressure difference signal for being detected by described differential pressure pickup converts the micro computer digital display meter of flow to.
2. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 1, is characterized in that, described differential flow signal generator is provided with pressure reduction high side pressure conducting tube and pressure reduction low side pressure transmission pipe;
The creeling of described pressure reduction high-end liquid cyclostrophic is provided with the water inlet be communicated with described pressure reduction high side pressure conducting tube;
Described pressure reduction low side liquid cyclostrophic creeling is provided with the water inlet be communicated with described pressure reduction low side pressure transmission pipe.
3. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 2, is characterized in that, the water inlet of described pressure reduction high-end liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction high-end liquid cyclostrophic creeling;
The water inlet of described pressure reduction low side liquid cyclostrophic creeling is positioned at the sidewall bottom of described pressure reduction low side liquid cyclostrophic creeling.
4. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 2, it is characterized in that, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction high-end liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction high-end liquid cyclostrophic creeling;
The deflating valve of described pressure reduction low side liquid cyclostrophic creeling be arranged on the creeling of described pressure reduction low side liquid cyclostrophic sidewall and higher than the water inlet of described pressure reduction low side liquid cyclostrophic creeling.
5. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 1, it is characterized in that, the high-end liquid cyclostrophic creeling of described pressure reduction and the creeling of pressure reduction low side liquid cyclostrophic are respectively provided with a valve, the valve of described pressure reduction high-end liquid cyclostrophic creeling is described pressure reduction high-end liquid cyclostrophic creeling and the connecting interface of differential pressure pickup, and the valve of described pressure reduction low side liquid cyclostrophic creeling is described pressure reduction low side liquid cyclostrophic creeling and the connecting interface of differential pressure pickup;
The valve of described pressure reduction high-end liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling;
The valve of described pressure reduction low side liquid cyclostrophic creeling is higher than the deflating valve of described pressure reduction low side liquid cyclostrophic creeling.
6. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 5, is characterized in that, the deflating valve of described pressure reduction high-end liquid cyclostrophic creeling and the deflating valve of described pressure reduction low side liquid cyclostrophic creeling contour.
7. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 5, it is characterized in that, also comprise: the high-end electric control valve of pressure reduction, pressure reduction low side electric control valve and control the control circuit of the high-end electric control valve of described pressure reduction and pressure reduction low side electric control valve;
The high-end electric control valve of described pressure reduction be connected on the creeling of described pressure reduction high-end liquid cyclostrophic be connected with differential pressure pickup between in gas circuit; Described pressure reduction low side electric control valve be connected on described pressure reduction low side liquid cyclostrophic creeling be connected with differential pressure pickup between in gas circuit;
The high-end electric control valve of described pressure reduction at least comprises three tunnels, one tunnel of the high-end electric control valve of described pressure reduction is communicated with the valve of described pressure reduction high-end liquid cyclostrophic creeling, another road of the high-end electric control valve of described pressure reduction is measured mouth with described differential pressure pickup first and is connected, and also has a road and air conducting;
Described pressure reduction low side electric control valve at least comprises three tunnels, one tunnel of described pressure reduction low side electric control valve is communicated with the valve of described pressure reduction low side liquid cyclostrophic creeling, another road of described pressure reduction low side electric control valve is measured mouth with described differential pressure pickup second and is connected, and also has a road and air conducting.
8. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 1, is characterized in that, described self-loopa Bernoulli Jacob experiment instrument also includes:
Self-loopa supply tank;
Constant pressure water tank, the side of described constant pressure water tank is connected with described self-loopa supply tank, and opposite side is connected with described Bernoulli Jacob's experimental channel;
To be arranged in described self-loopa supply tank and electric control pump for supplying water to described constant pressure water tank;
Be arranged on the flow control valve of the afterbody of described Bernoulli Jacob's experimental channel;
To be connected with described self-loopa supply tank and for the self-loopa water recovery apparatus of the afterbody water outlet of accepting described Bernoulli Jacob's experimental channel;
The multiple straight pipe type piezometric tube that connect corresponding to the multiple pressure taps on described Bernoulli Jacob's experimental channel.
9. the self-loopa Bernoulli Jacob experimental provision possessing teaching efficiency flow digital display according to claim 8, is characterized in that, described Bernoulli Jacob's experimental channel comprises the pipeline section of pipe diameter size change and the pipeline section of pipe height change of series connection.
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| CN106066198A (en) * | 2016-07-01 | 2016-11-02 | 环境保护部南京环境科学研究所 | A kind of easy device measuring biogas volume in collection airbag and assay method |
| CN106097841A (en) * | 2016-08-22 | 2016-11-09 | 浙江大学 | Object constant speed water outlet experimental provision |
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| CN104952323B (en) | 2017-08-08 |
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